The structure and characteristics of the turntable bearing seat
The slewing bearing seat is a large and extra large bearing seat that can withstand comprehensive loads and has a special structure. It is required to have the characteristics of compact structure, flexible rotation, and convenient installation and maintenance. Compared with ordinary bearing housings, slewing bearing housings have the following obvious features:
1. Dimensions
The diameter is usually 0.4m ~ 10m, up to 40m.
2. High carrying capacity
Generally, it can bear axial load, radial load and overturning moment load at the same time.
3. Low speed
The working speed is lower than 10r/min, and in a few cases, it does not rotate continuously, but only rotates within a certain angle and performs swinging motion.
4. With bearing housing installation hole
It can be fastened on the upper and lower supports with screws.
5. No pivot
The inner or outer ring has gears for driving the rotation.
6. With smooth oil hole and seal installation.
The main structural methods of the slewing bearing seat are: four-point contact ball slewing bearing seat, double row angular contact thrust ball slewing bearing seat, interspersed cylindrical roller slewing bearing seat, interspersed tapered roller slewing bearing seat, three-row cylindrical roller fit Turntable bearing housing.
According to whether it can have teeth and the distribution of gears, it can be divided into different structures such as gearless type, external gear type or internal gear type.
Among them, the four-point contact ball slewing bearing housing has a high static load capacity, the intersecting cylindrical roller slewing bearing housing has a high dynamic load capacity, and the intersecting tapered roller slewing bearing housing can improve the support rigidity and rotation accuracy by applying a preload. The three-row cylindrical roller combined with the slewing bearing seat increases the height of the bearing seat to improve the bearing capacity, and the load is received by different raceways. Therefore, under the same stress condition, the diameter of the bearing seat can be greatly reduced, so that the main engine More compact, it is a turntable bearing housing with high load capacity.
Turntable bearing housings are widely used in large-scale slewing installations such as lifting and transportation machinery, mining machinery, construction machinery, port machinery, ship machinery and high-precision radar.
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